EVERYDAY SCIENCE

Detailed explanation-1: -Then, from 10-36 to 10-32 seconds after the Big Bang, the temperature of the universe was low enough (1028 K) that the forces of electromagnetism (strong force) and weak nuclear forces (weak interaction) were able to separate as well, forming two distinct forces.

Detailed explanation-2: -These were mainly helium and hydrogen, which are still by far the most abundant elements in the universe. Present observations suggest that the first stars formed from clouds of gas around 150–200 million years after the Big Bang.

Detailed explanation-3: -The standard model of big bang cosmology, known as lambda cold dark matter, proposes two hypothetical entities―dark matter and dark energy―to explain the structure and history of the universe.

Detailed explanation-4: -The universe continued to expand, but not as quickly as during inflation. As the universe cooled, the four fundamental forces in nature emerged: gravity, the strong force, the weak force and the electromagnetic force. Protons and neutrons began to form.

Detailed explanation-5: -These three observations are (1) the expansion of the universe as measured by the redshift of light emitted from galaxies (2) the existence of the cosmic background radiation and (3) the relative amounts of hydrogen, helium and deuterium in the universe.